Understory (or understorey) is the term for the area of a forest which grows in the shade of the emergent or forest canopy. A forest is an area with a high density of Trees There are many definitions of a forest based on various criteria Plants in the understory consist of a mixture of seedlings and saplings of canopy trees together with understory shrubs and herbs. A shrub or Bush is a horticultural rather than strictly botanical category of Woody plant, distinguished from a Tree Young canopy trees often persist as suppressed juveniles for decades while they wait for an opening in the forest overstory which will enable their growth into the canopy. On the other hand, understory shrubs are able to complete their life cycle in the shade of the forest canopy. A life cycle is a period involving 1 Generation of an Organism through means of Reproduction, whether through Asexual reproduction or Sexual Also some small trees such as dogwood and holly rarely grow tall and are generally understory trees. The Dogwoods comprise a group of 30-50 species of mostly Deciduous Woody plants growing as Shrubs and Trees some species are herbaceous perennial Holly ( Ilex) is a Genus of about 600 Species of Flowering plants in the family Aquifoliaceae, and the only

Forest understories have lower light intensities. The wavelengths of light that are available are only a subset of those that are available in full sunlight. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. Understory plants must therefore be shade tolerant—they must be able to photosynthesize successfully with the limited amount of light that is available. Shade tolerance is an Ecological concept that refers to Plants abilities to tolerate low Light levels Photosynthesis is a Metabolic pathway that converts Light Energy into Chemical energy. They are often able to use wavelengths not available to canopy trees. In temperate deciduous forests understory seedlings "leaf out" before the canopy trees do. Temperate broadleaf and mixed forests temperate deciduous forest) --> are a Temperate and Humid Biome. This is important because it allows the understory plants a window in which to photosynthesize without the canopy present. This brief period (usually 1–2 weeks) is often a crucial period which allows the plant to maintain a net positive carbon balance over the course of the year.

Forest understories also have higher humidity than exposed areas. The forest canopy reduces solar radiation, so the ground does not heat up as rapidly. Consequently, the understory dries out more slowly than does more exposed areas. The greater humidity allows fungi and other decomposers to flourish. A fungus (ˈfʌŋgəs is a eukaryotic Organism that is a member of the kingdom Fungi (ˈfʌndʒaɪ This drives nutrient cycling, and provides favorable microclimates for many animals and plants. In Ecology and Earth science, a biogeochemical cycle is a circuit or pathway by which a Chemical element or Molecule moves through both biotic A microclimate is a local atmospheric zone where the Climate differs from the surrounding area Plants are living Organisms belonging to the kingdom Plantae.

See also

• Overgrazing

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